139688863 has 2 divisors, whose sum is σ = 139688864. Its totient is φ = 139688862.

The previous prime is 139688849. The next prime is 139688891. The reversal of 139688863 is 368886931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139688863 - 2¹⁷ = 139557791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139688863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139688803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69844431 + 69844432.

It is an arithmetic number, because the mean of its divisors is an integer number (69844432).

Almost surely, 2^139688863 is an apocalyptic number.

139688863 is a deficient number, since it is larger than the sum of its proper divisors (1).

139688863 is an equidigital number, since it uses as much as digits as its factorization.

139688863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 52.

The square root of 139688863 is about 11819.0043150851. The cubic root of 139688863 is about 518.8644636755.

The spelling of 139688863 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, eight hundred sixty-three".